Title :
Key-Insulated Group Signature Scheme with Selective Revocation
Author :
Li, Rupeng ; Xianghua ; Li, Guowen ; Yu, Jia ; Li, Daxing
Author_Institution :
Shandong Univ., Jinan
Abstract :
In group signature schemes, the user\´s group secret key is often stored on insecure devices e.g. mobile phones that are likely to be compromised by an adversary. Once the group secret key of a group member is found stolen, he will be revoked and can not sign documents anymore. To mitigate the damage of key exposure in group signature schemes, we proposed a key-insulated group signature scheme. The group secret key stored on an insecure device is refreshed at discrete time periods via interaction with a physically-secure device that stores a "master key ". Our scheme has secure and random-access key updates. The exposure of up to t of the N time periods, chosen adoptively by the adversary, still keeps any period that was not exposed secure. Our scheme supports selective revocation, i.e. only revoking the user\´s signing ability for some periods that were exposed, which is appropriate for the key-insulated group signature scheme.
Keywords :
security of data; discrete time periods; key-insulated group signature scheme; mobile phones; physically-secure device; random-access key updates; selective revocation; user group secret key; Computer science; Computer security; Data security; Educational institutions; Electron traps; Electronic voting; Information security; Insulation; Mobile handsets; Public key cryptography;
Conference_Titel :
Multimedia and Ubiquitous Engineering, 2007. MUE '07. International Conference on
Conference_Location :
Seoul
Print_ISBN :
0-7695-2777-9
DOI :
10.1109/MUE.2007.144